An internal implementation would be probably faster.
If timing is that critical for you, you can have a look in
EmbeddedGraphDbImpl.getAllNodes() and implement a similar solution for
relationships.
Cheers
Michael
Am 23.07.2011 um 04:20 schrieb John cyuczieekc:
Hey Jim,
I am sort of glad
Hey Michael,
I took a very quick look, I think understand it, looks like it attempts to
get nodes by id starting from 0 until highest possible ID.
public synchronized boolean hasNext()
{
while ( currentNode == null currentNodeId = highId )
{
try
Right, there could be even a faster ways but they would need a few additional
methods in
NodeManager :)
Cheers
Michael
Am 23.07.2011 um 15:30 schrieb John cyuczieekc:
Hey Michael,
I took a very quick look, I think understand it, looks like it attempts to
get nodes by id starting from 0
thanks for that, I only had embedded-examples changed, but it looks like I
was doing the git pull wrong, that is I was using `git fetch from upstream`
instead of `git pull`... I actually never had to use this before :) I was
only ever committing with git (used svn/mercurial before though) For
you would have never gotten the update
git pull does a fetch and merge
please read a quick intro to git
there are many on the internets
mobile mail please excuse brevity and typos
Am 22.07.2011 um 08:10 schrieb cyuczi eekc cyuczie...@gmail.com:
thanks for that, I only had embedded-examples
How would I go about getting all relationships in the entire database ?
(with neo4j embedded)
I see there is an db.getAllNodes() for nodes
is there something similar for relationships?
On Wed, Jul 20, 2011 at 7:13 PM, cyuczi eekc cyuczie...@gmail.com wrote:
Is there a way to get the number of
for (Node node : db.getAllNodes()) for (Relationship rel :
node.getRelationships(Direction.OUTGOING)) {
// your code here
}
Michael
Am 22.07.2011 um 23:40 schrieb John cyuczieekc:
How would I go about getting all relationships in the entire database ?
(with neo4j embedded)
I see there is
Though that is kind of telling me that relationships only exist in java as
wrappers for an ordered tuple of nodes. I guess I was thinking that they
were stored/accessed differently as unique objects(since they each have an
id)... maybe they are but neo4j isn't exposing a method for parsing
Hi John,
Relationships are stored in a different store than nodes. This enables Neo4j to
manage lifecycle events (like caching) for nodes and relationships separately.
Neo4j really is a graph DB, not a tripple store masquerading as a graph DB.
Nonetheless, that code Michael sent still works
Hey Jim,
I am sort of glad to hear that, maybe in the future I could see a method
like getAllRelationships(), or not, np :)
Yes, using Michael's code works, but ...
total relations count=100,011 timedelta=3,075,897,991 ns
it kind of takes 3 seconds (when not cached) to count 100k relationships
We're already on it. Looking through the causes for that issue and will keep
you and everyone else informed.
Michael
Am 21.07.2011 um 06:52 schrieb cyuczi eekc:
about this, should I create an issue?
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Hey, btw, the issue was fixed: https://trac.neo4j.org/ticket/356#comment:1
However, github didn't yet sync the git-readonly (ie. git://
github.com/neo4j/community.git ) and looks like I am 3-4 days back, since my
HEAD is at:
Minor fix to the cypher/identifiers section.
github has no separate repo
for tge readonly url
most probably your git pull failed due to local changes
git stash
them or use
git pull --rebase
Michael
mobile mail please excuse brevity and typos
Am 22.07.2011 um 04:32 schrieb cyuczi eekc cyuczie...@gmail.com:
Hey, btw, the issue was
Is there a way to get the number of relationships without having to iterate
through (and count++) them?
ie. rels=firstNode.getRelationships();
rels.size(); //doesn't actually exist
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Hi,
Responses from calling the Neo4j APIs are typically lazy, for performance
reasons. So there's no way of eagerly counting the number of relationships
unless you force eager evaluation as you've suggested below.
Jim
On 20 Jul 2011, at 11:13, cyuczi eekc wrote:
Is there a way to get the
I guess I was hoping it(size/count) was cached in the database or the
underlaying database would provide this somehow, ie. in berkeleydb (java
edition) there's a cursor.count() I could use (though I don't know how they
did it implementation-wise)
Thanks! I needed to know that.
On Wed, Jul 20,
Caching that result would require synchronizing it with every change using up
memory and performance (at every change) for something that can be computed
So far it has not been worth the effort.
If you really need that value very often you could write a small
TransactionEventHandler that keeps
Trying to count the relationships the normal way I find that oddly, I
cannot see more than 100+x relationships, where x is the maximum number of
relations ever added within a transaction.
For example, if I add 91 relationships in a transation, and I count them,
I have 91. I run the program again
I should probably mention that I am using neo4j community (embedded) latest
sources up to date from github
On Thu, Jul 21, 2011 at 4:59 AM, cyuczi eekc cyuczie...@gmail.com wrote:
Trying to count the relationships the normal way I find that oddly, I
cannot see more than 100+x relationships,
Ok there, I found out something new, if I do the count outside of the
transaction (ie. after tx.finish() ) then it works right,
ie. in a different example:
Node `one` has 100,100 out rels, time=7,954,653,001
tx.finish() time=1,525,669,261
Node `one` has 1,200,546 out rels
And as long as I create
about this, should I create an issue?
On Thu, Jul 21, 2011 at 5:15 AM, cyuczi eekc cyuczie...@gmail.com wrote:
Ok there, I found out something new, if I do the count outside of the
transaction (ie. after tx.finish() ) then it works right,
ie. in a different example:
Node `one` has 100,100
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